The Tiffen 46-43mm Step-Down Ring is a reliable and economical way to use filters. For example, a 52-49mm Step-Down ring would allow you to use 49mm filters on lenses with a 52mm front filter thread size. Care must be taken using Step-Down rings in order to avoid vignetting.
Note: Tiffen also produces Step-Up Rings which allow larger sized filters to be used on lenses with smaller front filter thread sizes. For example, a 49-52mm Step-Up Ring would allow a 52mm filter to be used on a lens with a front filter thread size of 49mm.
Small, efficient way to save space and money at the same time
Allows user to buy fewer filters but continue to shoot the images they want
Tiffen, a leader in the production of filters for still, video and cinematography, also produces these rings to assist photographers in their work